Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong vang hye snippets" » "cong lang hye snippets", "cong quang hye snippets", "cong ngang hye snippets", "cong yang hye snippets", "cong hwang hye snippets", "cong vang de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung java java snippets") or ("cong vang hye snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("cong vang hye snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cong vang hye snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cong vang hye snippets"))) or ("locating bug code snippets"))*.